US3644985A - Process for producing probe heads, and probe head for internal comparison measurements - Google Patents

Process for producing probe heads, and probe head for internal comparison measurements Download PDF

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Publication number
US3644985A
US3644985A US851863A US3644985DA US3644985A US 3644985 A US3644985 A US 3644985A US 851863 A US851863 A US 851863A US 3644985D A US3644985D A US 3644985DA US 3644985 A US3644985 A US 3644985A
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US
United States
Prior art keywords
closure member
tubular member
tube
probe
probe head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US851863A
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English (en)
Inventor
Hermann Koltgen
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Individual
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Individual
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Publication date
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Publication of US3644985A publication Critical patent/US3644985A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00 relating to soldering or welding
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
    • G01B5/12—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters internal diameters

Definitions

  • the present invention is concerned with a method for producing accurate instruments intended to be used for internal measurements and for gauging bores or other passages or cavities.
  • Such instruments are known and can be classified, in general, into at least three main types which are fixed gauges, such as limit gauges, leaf gauges, ball end gauges, and the like; directly indicating internal measuring instruments, such as internal micrometers, vemier gauges, clock gauges, and the like; indicating internal measuring instruments, such as probe heads, self-centering measuring heads, pneumatic measuring apparatus for internal measurements, and the like.
  • fixed gauges such as limit gauges, leaf gauges, ball end gauges, and the like
  • directly indicating internal measuring instruments such as internal micrometers, vemier gauges, clock gauges, and the like
  • indicating internal measuring instruments such as probe heads, self-centering measuring heads, pneumatic measuring apparatus for internal measurements, and the like.
  • the invention is primarily concerned with the so-called twopoint internal measuring instruments, also known as probe heads or expansion heads.
  • probe heads are used on a large scale due to their great accuracy and ease of handling.
  • the manufacture of such probe heads requires very precise workmanship in order to satisfy the requirement for the high precision expected of these measuring instruments.
  • An object of the invention is to provide a new method of manufacturing a probe head which comprises applying a closure member, preferably by means of a sleeve connection, to the end of a tube, securing them together, forming a central longitudinal slit extending axially inwardly from the outer extremity of the closure member into the end of the tube adjacent the closure member, and preferably forming the opposite end of the tube for attachment to a holder.
  • the invention also includes, amongst others, the following features, used either singly or in combination, viz: forming the closure member, before it is slit, as a solid figure of revolution; shaping the meeting surfaces of the closure member and the tube end so that their cooperating surfaces lie accurately in a plane perpendicular to the axis of the tube; forming the sleeve joint between the closure member and the tube so that the latter fits within a recess in the closure member; or alternatively, forming the closure member with an extension or stem which is fitted into the end of the tube; also making the provision that the stem or extension, in the immediate vicinity of the tube end, is of reduced diameter in order to provide a shoulder with which the end of the tube will abut.
  • the tube as well as the closure member are made from metal capable of hardening and both parts are attached by soldering.
  • both the closure member and tube are hardened simultaneously after attachment to each other. It is advantageous to grind the closure member concentrically after hardening.
  • FIG. 1 is a partly sectional view of a measuring device with an indicator dial holder and probe head according to the invention
  • FIG. 2 is an elevational view of the probe head according to FIG. 1;
  • FIG. 3 is a mainly axial sectional view of embodiments of the constructional elements of one form of a probe head according to the invention
  • FIG. 4 is a mainly axial sectional view of different embodiments of the constructional elements of a probe head, FIG. 4d being an elevational view;
  • FIG. 5 is a partly sectional view of a measuring device with an indicator dial holder and a further embodiment of the probe head according to the invention.
  • FIG. 6 is a sectional view, on an enlarged scale, of a constructional detail of the probe head according to FIG. 5.
  • FIG. 1 a bore comparator is shown consisting of an indicator dial 1, the support or shaft 2 of which is held firmly in position by a tensioning nut 3 in an indicator dial holder 4.
  • a probe head 5 according to the invention is shown held within the holder 4.
  • the actuator bolt 6 of the indicator dial presses against the upper end 7 of an actuator rod 9 located within the probe.
  • the conical end 10 of rod 9 expands the two probe faces 11 and 11 apart until they come into contact with the bore wall 12 (i.e., the bore to be measured or gauged) as indicated in the Figure.
  • the measurements of the conical end 10 are designed to translate the expansion into a longitudinal displacement of the actuator rod 9 in the ratio 1:1, thereby transferring the expansion to the indicator dial.
  • the probe head 5 as clearly shown in FIGS. 1 and 2, has a substantially hollow shaft 13 having an axial slit I4 and an actuator rod 9.
  • the invention is based on the consideration that production costs of the probe heads can be substantially reduced if the precision work involved in the comparatively long, narrow boring of the shaft could be omitted.
  • the probe head hitherto made from a precision turned part is now assembled from several parts formed in such a way as to allow separate production at comparatively low cost but having very high precision, which can be assembled afterwards by simple means but with great exactness.
  • FIG. 3a shows the closure member 15 manufactured as a mass-produced or pressed article in its final shape. It is formed with a cylindrical bore 16 into which is inserted the, end of a seemless tube 17 illustrated in FIG. 3b. That part of the closure member exhibiting an annular enlargement I8 encloses the end of the tube 17.
  • the tube has a level front surface 20 which is perpendicular to the axis 19 of the tube and which will be brought into snug contact with the corresponding counter surface 21 at the bottom of the bore of member 15.
  • the parts are assembled in a very exact fit, as indicated in FIG. 30, and are soldered together.
  • FIG. 4 serves to illustrate a variant of the production process described with reference to FIG. 3.
  • the closure member 15 represented in FIG. 4a is made as a turned piece, and possesses a stcmlike turned portion 22 which is provided with a central narrow bore 23.
  • the diameter of the bore 23 amounts to 0.28 mm. in a practical probe head.
  • the tube 17 indicated in FIG. 4b is pushed over the plug 22 as indicated in FIG. 4c, and the parts are. then soldered together.
  • the tube and a part of the cylindrical plug 22 are now removed by grinding, in a single operation, of the closure member I5 the surface of which is formed like a ball and also at 24, so that the form shown in FIG. M is obtained.
  • the length of the plug which has been thinned down by this grinding depends on the desired probing depth of the finished probe head; the distance 1 for the usual forms of small probe heads amounts to between 1.5 and 3 mm.
  • the probe head according to the invention By means of the probe head according to the invention the possibility is provided for the first time to carry out internal comparison measurements in comparatively deep narrow bores. By this means a new field of application is opened for this measuring process, and the advantages of this proven measuring process can also be used under measuring conditions where this has up to now not been practical.
  • FIG. 5 shows a bore comparator according to FIG. 1, however with a measuring head according to FIG. 4.
  • FIG. 6 shows, in cross section, on an enlarged scale as compared with FIG. 5, constructional details of the end of the probe head of FIG. 5.
  • a stepped actuator rod 9' is used, the thinner end of which protrudes into the bore of the closure member.
  • a method of making a probe head comprising the steps of providing a tubular member having an open end bounded by an annular end face extending normal to the axis of said tubular member; providing a closure member for said open end with an abutment face for said end face; positioning said closure member on said tubular member so that it closes said open end and said abutment face covers and contacts said end face; soldering said members to one another to connect them as a unit; forming said unit with a central slit extending through said closure member and into said tubular member axially of the latter; hardening said members simultaneously;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Materials For Medical Uses (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
US851863A 1968-08-24 1969-08-21 Process for producing probe heads, and probe head for internal comparison measurements Expired - Lifetime US3644985A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1285268A CH472020A (de) 1968-08-24 1968-08-24 Verfahren zum Herstellen von Tastköpfen und Tastkopf für Vergleichs-Innenmessungen

Publications (1)

Publication Number Publication Date
US3644985A true US3644985A (en) 1972-02-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US851863A Expired - Lifetime US3644985A (en) 1968-08-24 1969-08-21 Process for producing probe heads, and probe head for internal comparison measurements

Country Status (4)

Country Link
US (1) US3644985A (de)
CH (1) CH472020A (de)
DE (2) DE6925555U (de)
GB (1) GB1224154A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4270257A (en) * 1975-04-26 1981-06-02 Ntn Toyo Bearing Co. Ltd. Method for manufacturing a fuel injection valve
CN100395512C (zh) * 2004-07-02 2008-06-18 鸿富锦精密工业（深圳）有限公司 表面形貌测量用触针及其制备方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995374A (en) * 1975-08-26 1976-12-07 Fisk James C Small internal diameter bore gauge
US4348812A (en) * 1981-01-29 1982-09-14 Middleton Forest L Gun barrel internal diameter indicator
US4536963A (en) * 1983-08-29 1985-08-27 Mitutoyo Mfg. Co., Ltd. Digital indication type measuring machine
DE3923401C2 (de) * 1989-07-14 1995-05-11 Siemens Ag Verfahren zum fernbedienten Ausmessen von Passungsbohrungen in überfluteten Bauteilen und eine Vorrichtung zur Durchführung des Verfahrens
US5440819A (en) * 1994-04-19 1995-08-15 Comtorgage Corporation Actuator and programmable amplifier for an expanding plug gage head
DE19534259A1 (de) * 1995-09-15 1997-03-20 Ibb Technomess Gmbh Werkzeug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1889974A (en) * 1929-08-14 1932-12-06 George L Chamberlain Method of joining telescoped tubular members
US2563984A (en) * 1947-11-29 1951-08-14 Lufkin Rule Co Adjustable plug gauge
US2741850A (en) * 1952-12-19 1956-04-17 Edwin D Reed Gage unit
US3367020A (en) * 1965-05-19 1968-02-06 Robert D. Watson Method of preparing tubes of certain metals for subsequent joining by welding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1889974A (en) * 1929-08-14 1932-12-06 George L Chamberlain Method of joining telescoped tubular members
US2563984A (en) * 1947-11-29 1951-08-14 Lufkin Rule Co Adjustable plug gauge
US2741850A (en) * 1952-12-19 1956-04-17 Edwin D Reed Gage unit
US3367020A (en) * 1965-05-19 1968-02-06 Robert D. Watson Method of preparing tubes of certain metals for subsequent joining by welding

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4270257A (en) * 1975-04-26 1981-06-02 Ntn Toyo Bearing Co. Ltd. Method for manufacturing a fuel injection valve
CN100395512C (zh) * 2004-07-02 2008-06-18 鸿富锦精密工业（深圳）有限公司 表面形貌测量用触针及其制备方法

Also Published As

Publication number Publication date
GB1224154A (en) 1971-03-03
DE1932674B2 (de) 1973-03-08
DE1932674A1 (de) 1970-02-26
DE1932674C3 (de) 1973-09-27
DE6925555U (de) 1970-01-08
CH472020A (de) 1969-04-30

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